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;;;; the printer
;;;; This software is part of the SBCL system. See the README file for
;;;; more information.
;;;;
;;;; This software is derived from the CMU CL system, which was
;;;; written at Carnegie Mellon University and released into the
;;;; public domain. The software is in the public domain and is
;;;; provided with absolutely no warranty. See the COPYING and CREDITS
;;;; files for more information.
(in-package "SB!IMPL")
;;;; exported printer control variables
;;; FIXME: Many of these have nontrivial types, e.g. *PRINT-LEVEL*,
;;; *PRINT-LENGTH*, and *PRINT-LINES* are (OR NULL UNSIGNED-BYTE).
(defvar *print-readably* nil
#!+sb-doc
"If true, all objects will be printed readably. If readable printing
is impossible, an error will be signalled. This overrides the value of
*PRINT-ESCAPE*.")
(defvar *print-escape* t
#!+sb-doc
"Should we print in a reasonably machine-readable way? (possibly
overridden by *PRINT-READABLY*)")
(defvar *print-pretty* nil ; (set later when pretty-printer is initialized)
#!+sb-doc
"Should pretty printing be used?")
(defvar *print-base* 10.
#!+sb-doc
"The output base for RATIONALs (including integers).")
(defvar *print-radix* nil
#!+sb-doc
"Should base be verified when printing RATIONALs?")
(defvar *print-level* nil
#!+sb-doc
"How many levels should be printed before abbreviating with \"#\"?")
(defvar *print-length* nil
#!+sb-doc
"How many elements at any level should be printed before abbreviating
with \"...\"?")
(defvar *print-circle* nil
#!+sb-doc
"Should we use #n= and #n# notation to preserve uniqueness in general (and
circularity in particular) when printing?")
(defvar *print-case* :upcase
#!+sb-doc
"What case should the printer should use default?")
(defvar *print-array* t
#!+sb-doc
"Should the contents of arrays be printed?")
(defvar *print-gensym* t
#!+sb-doc
"Should #: prefixes be used when printing symbols with null SYMBOL-PACKAGE?")
(defvar *print-lines* nil
#!+sb-doc
"The maximum number of lines to print per object.")
(defvar *print-right-margin* nil
#!+sb-doc
"The position of the right margin in ems (for pretty-printing).")
(defvar *print-miser-width* nil
#!+sb-doc
"If the remaining space between the current column and the right margin
is less than this, then print using ``miser-style'' output. Miser
style conditional newlines are turned on, and all indentations are
turned off. If NIL, never use miser mode.")
(defvar *print-pprint-dispatch*)
#!+sb-doc
(setf (fdocumentation '*print-pprint-dispatch* 'variable)
"The pprint-dispatch-table that controls how to pretty-print objects.")
(defvar *suppress-print-errors* nil
#!+sb-doc
"Suppress printer errors when the condition is of the type designated by this
variable: an unreadable object representing the error is printed instead.")
(defmacro with-standard-io-syntax (&body body)
#!+sb-doc
"Bind the reader and printer control variables to values that enable READ
to reliably read the results of PRINT. These values are:
*PACKAGE* the COMMON-LISP-USER package
*PRINT-ARRAY* T
*PRINT-BASE* 10
*PRINT-CASE* :UPCASE
*PRINT-CIRCLE* NIL
*PRINT-ESCAPE* T
*PRINT-GENSYM* T
*PRINT-LENGTH* NIL
*PRINT-LEVEL* NIL
*PRINT-LINES* NIL
*PRINT-MISER-WIDTH* NIL
*PRINT-PPRINT-DISPATCH* the standard pprint dispatch table
*PRINT-PRETTY* NIL
*PRINT-RADIX* NIL
*PRINT-READABLY* T
*PRINT-RIGHT-MARGIN* NIL
*READ-BASE* 10
*READ-DEFAULT-FLOAT-FORMAT* SINGLE-FLOAT
*READ-EVAL* T
*READ-SUPPRESS* NIL
*READTABLE* the standard readtable
SB-EXT:*SUPPRESS-PRINT-ERRORS* NIL
"
`(%with-standard-io-syntax (lambda () ,@body)))
(defun %with-standard-io-syntax (function)
(declare (type function function))
(let ((*package* (find-package "COMMON-LISP-USER"))
(*print-array* t)
(*print-base* 10)
(*print-case* :upcase)
(*print-circle* nil)
(*print-escape* t)
(*print-gensym* t)
(*print-length* nil)
(*print-level* nil)
(*print-lines* nil)
(*print-miser-width* nil)
(*print-pprint-dispatch* sb!pretty::*standard-pprint-dispatch-table*)
(*print-pretty* nil)
(*print-radix* nil)
(*print-readably* t)
(*print-right-margin* nil)
(*read-base* 10)
(*read-default-float-format* 'single-float)
(*read-eval* t)
(*read-suppress* nil)
(*readtable* *standard-readtable*)
(*suppress-print-errors* nil))
(funcall function)))
;;;; routines to print objects
;;; keyword variables shared by WRITE and WRITE-TO-STRING, and
;;; the bindings they map to.
(eval-when (:compile-toplevel :load-toplevel)
(defvar *printer-keyword-variables*
'(:escape *print-escape*
:radix *print-radix*
:base *print-base*
:circle *print-circle*
:pretty *print-pretty*
:level *print-level*
:length *print-length*
:case *print-case*
:array *print-array*
:gensym *print-gensym*
:readably *print-readably*
:right-margin *print-right-margin*
:miser-width *print-miser-width*
:lines *print-lines*
:pprint-dispatch *print-pprint-dispatch*
:suppress-errors *suppress-print-errors*)))
(defun write (object &key
((:stream stream) *standard-output*)
((:escape *print-escape*) *print-escape*)
((:radix *print-radix*) *print-radix*)
((:base *print-base*) *print-base*)
((:circle *print-circle*) *print-circle*)
((:pretty *print-pretty*) *print-pretty*)
((:level *print-level*) *print-level*)
((:length *print-length*) *print-length*)
((:case *print-case*) *print-case*)
((:array *print-array*) *print-array*)
((:gensym *print-gensym*) *print-gensym*)
((:readably *print-readably*) *print-readably*)
((:right-margin *print-right-margin*)
*print-right-margin*)
((:miser-width *print-miser-width*)
*print-miser-width*)
((:lines *print-lines*) *print-lines*)
((:pprint-dispatch *print-pprint-dispatch*)
*print-pprint-dispatch*)
((:suppress-errors *suppress-print-errors*)
*suppress-print-errors*))
#!+sb-doc
"Output OBJECT to the specified stream, defaulting to *STANDARD-OUTPUT*."
(output-object object (out-synonym-of stream))
object)
;;; Optimize common case of constant keyword arguments
(define-compiler-macro write (&whole form object &rest keys)
(let (bind ignore)
(do ()
((not (cdr keys))
;; Odd number of keys, punt
(when keys
(return-from write form)))
(let* ((key (pop keys))
(value (pop keys))
(variable (or (getf *printer-keyword-variables* key)
(when (eq :stream key)
'stream)
(return-from write form))))
(when (assoc variable bind)
;; First key has precedence, but we still need to execute the
;; argument, and in the right order.
(setf variable (gensym "IGNORE"))
(push variable ignore))
(push (list variable value) bind)))
(unless (assoc 'stream bind)
(push (list 'stream '*standard-output*) bind))
(once-only ((object object))
`(let ,(nreverse bind)
,@(when ignore `((declare (ignore ,@ignore))))
(output-object ,object (out-synonym-of stream))
,object))))
(defun prin1 (object &optional stream)
#!+sb-doc
"Output a mostly READable printed representation of OBJECT on the specified
STREAM."
(let ((*print-escape* t))
(output-object object (out-synonym-of stream)))
object)
(defun princ (object &optional stream)
#!+sb-doc
"Output an aesthetic but not necessarily READable printed representation
of OBJECT on the specified STREAM."
(let ((*print-escape* nil)
(*print-readably* nil))
(output-object object (out-synonym-of stream)))
object)
(defun print (object &optional stream)
#!+sb-doc
"Output a newline, the mostly READable printed representation of OBJECT, and
space to the specified STREAM."
(let ((stream (out-synonym-of stream)))
(terpri stream)
(prin1 object stream)
(write-char #\space stream)
object))
(defun pprint (object &optional stream)
#!+sb-doc
"Prettily output OBJECT preceded by a newline."
(let ((*print-pretty* t)
(*print-escape* t)
(stream (out-synonym-of stream)))
(terpri stream)
(output-object object stream))
(values))
(defun write-to-string
(object &key
((:escape *print-escape*) *print-escape*)
((:radix *print-radix*) *print-radix*)
((:base *print-base*) *print-base*)
((:circle *print-circle*) *print-circle*)
((:pretty *print-pretty*) *print-pretty*)
((:level *print-level*) *print-level*)
((:length *print-length*) *print-length*)
((:case *print-case*) *print-case*)
((:array *print-array*) *print-array*)
((:gensym *print-gensym*) *print-gensym*)
((:readably *print-readably*) *print-readably*)
((:right-margin *print-right-margin*) *print-right-margin*)
((:miser-width *print-miser-width*) *print-miser-width*)
((:lines *print-lines*) *print-lines*)
((:pprint-dispatch *print-pprint-dispatch*)
*print-pprint-dispatch*)
((:suppress-errors *suppress-print-errors*)
*suppress-print-errors*))
#!+sb-doc
"Return the printed representation of OBJECT as a string."
(stringify-object object))
;;; Optimize common case of constant keyword arguments
(define-compiler-macro write-to-string (&whole form object &rest keys)
(let (bind ignore)
(do ()
((not (cdr keys))
;; Odd number of keys, punt
(when keys
(return-from write-to-string form)))
(let* ((key (pop keys))
(value (pop keys))
(variable (or (getf *printer-keyword-variables* key)
(return-from write-to-string form))))
(when (assoc variable bind)
;; First key has precedence, but we still need to execute the
;; argument, and in the right order.
(setf variable (gensym "IGNORE"))
(push variable ignore))
(push (list variable value) bind)))
(if bind
(once-only ((object object))
`(let ,(nreverse bind)
,@(when ignore `((declare (ignore ,@ignore))))
(stringify-object ,object)))
`(stringify-object ,object))))
(defun prin1-to-string (object)
#!+sb-doc
"Return the printed representation of OBJECT as a string with
slashification on."
(let ((*print-escape* t))
(stringify-object object)))
(defun princ-to-string (object)
#!+sb-doc
"Return the printed representation of OBJECT as a string with
slashification off."
(let ((*print-escape* nil)
(*print-readably* nil))
(stringify-object object)))
;;; This produces the printed representation of an object as a string.
;;; The few ...-TO-STRING functions above call this.
(defun stringify-object (object)
(let ((stream (make-string-output-stream)))
(setup-printer-state)
(output-object object stream)
(get-output-stream-string stream)))
;;;; support for the PRINT-UNREADABLE-OBJECT macro
(defun print-not-readable-error (object stream)
(restart-case
(error 'print-not-readable :object object)
(print-unreadably ()
:report "Print unreadably."
(let ((*print-readably* nil))
(output-object object stream)
object))
(use-value (o)
:report "Supply an object to be printed instead."
:interactive
(lambda ()
(read-evaluated-form "~@<Enter an object (evaluated): ~@:>"))
(output-object o stream)
o)))
;;; guts of PRINT-UNREADABLE-OBJECT
(defun %print-unreadable-object (object stream type identity body)
(declare (type (or null function) body))
(if *print-readably*
(print-not-readable-error object stream)
(flet ((print-description ()
(when type
(write (type-of object) :stream stream :circle nil
:level nil :length nil)
(write-char #\space stream)
(pprint-newline :fill stream))
(when body
(funcall body))
(when identity
(when (or body (not type))
(write-char #\space stream))
(pprint-newline :fill stream)
(write-char #\{ stream)
(write (get-lisp-obj-address object) :stream stream
:radix nil :base 16)
(write-char #\} stream))))
(cond ((print-pretty-on-stream-p stream)
;; Since we're printing prettily on STREAM, format the
;; object within a logical block. PPRINT-LOGICAL-BLOCK does
;; not rebind the stream when it is already a pretty stream,
;; so output from the body will go to the same stream.
(pprint-logical-block (stream nil :prefix "#<" :suffix ">")
(print-description)))
(t
(write-string "#<" stream)
(print-description)
(write-char #\> stream)))))
nil)
;;;; OUTPUT-OBJECT -- the main entry point
;;; Objects whose print representation identifies them EQLly don't
;;; need to be checked for circularity.
(defun uniquely-identified-by-print-p (x)
(or (numberp x)
(characterp x)
(and (symbolp x)
(symbol-package x))))
(defvar *in-print-error* nil)
;;; Output OBJECT to STREAM observing all printer control variables.
(defun output-object (object stream)
(labels ((print-it (stream)
(if *print-pretty*
(sb!pretty:output-pretty-object object stream)
(output-ugly-object object stream)))
(handle-it (stream)
(if *suppress-print-errors*
(handler-bind ((condition
(lambda (condition) nil
(when (typep condition *suppress-print-errors*)
(cond (*in-print-error*
(write-string "(error printing " stream)
(write-string *in-print-error* stream)
(write-string ")" stream))
(t
;; Give outer handlers a chance.
(with-simple-restart
(continue "Suppress the error.")
(signal condition))
(let ((*print-readably* nil)
(*print-escape* t))
(write-string
"#<error printing a " stream)
(let ((*in-print-error* "type"))
(output-object (type-of object) stream))
(write-string ": " stream)
(let ((*in-print-error* "condition"))
(output-object condition stream))
(write-string ">" stream))))
(return-from handle-it object)))))
(print-it stream))
(print-it stream)))
(check-it (stream)
(multiple-value-bind (marker initiate)
(check-for-circularity object t)
(if (eq initiate :initiate)
(let ((*circularity-hash-table*
(make-hash-table :test 'eq)))
(check-it (make-broadcast-stream))
(let ((*circularity-counter* 0))
(check-it stream)))
;; otherwise
(if marker
(when (handle-circularity marker stream)
(handle-it stream))
(handle-it stream))))))
(cond (;; Maybe we don't need to bother with circularity detection.
(or (not *print-circle*)
(uniquely-identified-by-print-p object))
(handle-it stream))
(;; If we have already started circularity detection, this
;; object might be a shared reference. If we have not, then
;; if it is a compound object it might contain a circular
;; reference to itself or multiple shared references.
(or *circularity-hash-table*
(compound-object-p object))
(check-it stream))
(t
(handle-it stream)))))
;;; a hack to work around recurring gotchas with printing while
;;; DEFGENERIC PRINT-OBJECT is being built
;;;
;;; (hopefully will go away naturally when CLOS moves into cold init)
(defvar *print-object-is-disabled-p*)
;;; Output OBJECT to STREAM observing all printer control variables
;;; except for *PRINT-PRETTY*. Note: if *PRINT-PRETTY* is non-NIL,
;;; then the pretty printer will be used for any components of OBJECT,
;;; just not for OBJECT itself.
(defun output-ugly-object (object stream)
(typecase object
;; KLUDGE: The TYPECASE approach here is non-ANSI; the ANSI definition of
;; PRINT-OBJECT says it provides printing and we're supposed to provide
;; PRINT-OBJECT methods covering all classes. We deviate from this
;; by using PRINT-OBJECT only when we print instance values. However,
;; ANSI makes it hard to tell that we're deviating from this:
;; (1) ANSI specifies that the user isn't supposed to call PRINT-OBJECT
;; directly.
;; (2) ANSI (section 11.1.2.1.2) says it's undefined to define
;; a method on an external symbol in the CL package which is
;; applicable to arg lists containing only direct instances of
;; standardized classes.
;; Thus, in order for the user to detect our sleaziness in conforming
;; code, he has to do something relatively obscure like
;; (1) actually use tools like FIND-METHOD to look for PRINT-OBJECT
;; methods, or
;; (2) define a PRINT-OBJECT method which is specialized on the stream
;; value (e.g. a Gray stream object).
;; As long as no one comes up with a non-obscure way of detecting this
;; sleaziness, fixing this nonconformity will probably have a low
;; priority. -- WHN 2001-11-25
(list
(if (null object)
(output-symbol object stream)
(output-list object stream)))
(instance
;; The first case takes the above idea one step further: If an instance
;; isn't a citizen yet, it has no right to a print-object method.
(cond ((sb!kernel::undefined-classoid-p (layout-classoid (layout-of object)))
;; not only is this unreadable, it's unprintable too.
(print-unreadable-object (object stream :identity t)
(format stream "UNPRINTABLE instance of ~W"
(layout-classoid (layout-of object)))))
((not (and (boundp '*print-object-is-disabled-p*)
*print-object-is-disabled-p*))
(print-object object stream))
((typep object 'structure-object)
(default-structure-print object stream *current-level-in-print*))
(t
(write-string "#<INSTANCE but not STRUCTURE-OBJECT>" stream))))
(funcallable-instance
(cond
((not (and (boundp '*print-object-is-disabled-p*)
*print-object-is-disabled-p*))
(print-object object stream))
(t (output-fun object stream))))
(function
(output-fun object stream))
(symbol
(output-symbol object stream))
(number
(etypecase object
(integer
(output-integer object stream))
(float
(output-float object stream))
(ratio
(output-ratio object stream))
(complex
(output-complex object stream))))
(character
(output-character object stream))
(vector
(output-vector object stream))
(array
(output-array object stream))
(system-area-pointer
(output-sap object stream))
(weak-pointer
(output-weak-pointer object stream))
(lra
(output-lra object stream))
(code-component
(output-code-component object stream))
(fdefn
(output-fdefn object stream))
#!+sb-simd-pack
(simd-pack
(output-simd-pack object stream))
(t
(output-random object stream))))
;;;; symbols
;;; values of *PRINT-CASE* and (READTABLE-CASE *READTABLE*) the last
;;; time the printer was called
(defvar *previous-case* nil)
(defvar *previous-readtable-case* nil)
;;; This variable contains the current definition of one of three
;;; symbol printers. SETUP-PRINTER-STATE sets this variable.
(defvar *internal-symbol-output-fun* nil)
;;; This function sets the internal global symbol
;;; *INTERNAL-SYMBOL-OUTPUT-FUN* to the right function depending on
;;; the value of *PRINT-CASE*. See the manual for details. The print
;;; buffer stream is also reset.
(defun setup-printer-state ()
(unless (and (eq *print-case* *previous-case*)
(eq (readtable-case *readtable*) *previous-readtable-case*))
(setq *previous-case* *print-case*)
(setq *previous-readtable-case* (readtable-case *readtable*))
(unless (member *print-case* '(:upcase :downcase :capitalize))
(setq *print-case* :upcase)
(error "invalid *PRINT-CASE* value: ~S" *previous-case*))
(unless (member *previous-readtable-case*
'(:upcase :downcase :invert :preserve))
(setf (readtable-case *readtable*) :upcase)
(error "invalid READTABLE-CASE value: ~S" *previous-readtable-case*))
(setq *internal-symbol-output-fun*
(case *previous-readtable-case*
(:upcase
(case *print-case*
(:upcase #'output-preserve-symbol)
(:downcase #'output-lowercase-symbol)
(:capitalize #'output-capitalize-symbol)))
(:downcase
(case *print-case*
(:upcase #'output-uppercase-symbol)
(:downcase #'output-preserve-symbol)
(:capitalize #'output-capitalize-symbol)))
(:preserve #'output-preserve-symbol)
(:invert #'output-invert-symbol)))))
;;; Output PNAME (a symbol-name or package-name) surrounded with |'s,
;;; and with any embedded |'s or \'s escaped.
(defun output-quoted-symbol-name (pname stream)
(write-char #\| stream)
(dotimes (index (length pname))
(let ((char (schar pname index)))
(when (or (char= char #\\) (char= char #\|))
(write-char #\\ stream))
(write-char char stream)))
(write-char #\| stream))
(defun output-symbol (object stream)
(if (or *print-escape* *print-readably*)
(let ((package (symbol-package object))
(name (symbol-name object))
(current (sane-package)))
(cond
;; The ANSI spec "22.1.3.3.1 Package Prefixes for Symbols"
;; requires that keywords be printed with preceding colons
;; always, regardless of the value of *PACKAGE*.
((eq package *keyword-package*)
(write-char #\: stream))
;; Otherwise, if the symbol's home package is the current
;; one, then a prefix is never necessary.
((eq package current))
;; Uninterned symbols print with a leading #:.
((null package)
(when (or *print-gensym* *print-readably*)
(write-string "#:" stream)))
(t
(multiple-value-bind (symbol accessible)
(find-symbol name current)
;; If we can find the symbol by looking it up, it need not
;; be qualified. This can happen if the symbol has been
;; inherited from a package other than its home package.
;;
;; To preserve print-read consistency, use the local nickname if
;; one exists.
(unless (and accessible (eq symbol object))
(let ((prefix (or (car (rassoc package (package-%local-nicknames current)))
(package-name package))))
(output-symbol-name prefix stream))
(multiple-value-bind (symbol externalp)
(find-external-symbol name package)
(declare (ignore symbol))
(if externalp
(write-char #\: stream)
(write-string "::" stream)))))))
(output-symbol-name name stream))
(output-symbol-name (symbol-name object) stream nil)))
;;; Output the string NAME as if it were a symbol name. In other
;;; words, diddle its case according to *PRINT-CASE* and
;;; READTABLE-CASE.
(defun output-symbol-name (name stream &optional (maybe-quote t))
(declare (type simple-string name))
(let ((*readtable* (if *print-readably* *standard-readtable* *readtable*)))
(setup-printer-state)
(if (and maybe-quote (symbol-quotep name))
(output-quoted-symbol-name name stream)
(funcall *internal-symbol-output-fun* name stream))))
;;;; escaping symbols
;;; When we print symbols we have to figure out if they need to be
;;; printed with escape characters. This isn't a whole lot easier than
;;; reading symbols in the first place.
;;;
;;; For each character, the value of the corresponding element is a
;;; fixnum with bits set corresponding to attributes that the
;;; character has. At characters have at least one bit set, so we can
;;; search for any character with a positive test.
(defvar *character-attributes*
(make-array 160 ; FIXME
:element-type '(unsigned-byte 16)
:initial-element 0))
(declaim (type (simple-array (unsigned-byte 16) (#.160)) ; FIXME
*character-attributes*))
;;; constants which are a bit-mask for each interesting character attribute
(defconstant other-attribute (ash 1 0)) ; Anything else legal.
(defconstant number-attribute (ash 1 1)) ; A numeric digit.
(defconstant uppercase-attribute (ash 1 2)) ; An uppercase letter.
(defconstant lowercase-attribute (ash 1 3)) ; A lowercase letter.
(defconstant sign-attribute (ash 1 4)) ; +-
(defconstant extension-attribute (ash 1 5)) ; ^_
(defconstant dot-attribute (ash 1 6)) ; .
(defconstant slash-attribute (ash 1 7)) ; /
(defconstant funny-attribute (ash 1 8)) ; Anything illegal.
(eval-when (:compile-toplevel :load-toplevel :execute)
;;; LETTER-ATTRIBUTE is a local of SYMBOL-QUOTEP. It matches letters
;;; that don't need to be escaped (according to READTABLE-CASE.)
(defparameter *attribute-names*
`((number . number-attribute) (lowercase . lowercase-attribute)
(uppercase . uppercase-attribute) (letter . letter-attribute)
(sign . sign-attribute) (extension . extension-attribute)
(dot . dot-attribute) (slash . slash-attribute)
(other . other-attribute) (funny . funny-attribute)))
) ; EVAL-WHEN
(flet ((set-bit (char bit)
(let ((code (char-code char)))
(setf (aref *character-attributes* code)
(logior bit (aref *character-attributes* code))))))
(dolist (char '(#\! #\@ #\$ #\% #\& #\* #\= #\~ #\[ #\] #\{ #\}
#\? #\< #\>))
(set-bit char other-attribute))
(dotimes (i 10)
(set-bit (digit-char i) number-attribute))
(do ((code (char-code #\A) (1+ code))
(end (char-code #\Z)))
((> code end))
(declare (fixnum code end))
(set-bit (code-char code) uppercase-attribute)
(set-bit (char-downcase (code-char code)) lowercase-attribute))
(set-bit #\- sign-attribute)
(set-bit #\+ sign-attribute)
(set-bit #\^ extension-attribute)
(set-bit #\_ extension-attribute)
(set-bit #\. dot-attribute)
(set-bit #\/ slash-attribute)
;; Mark anything not explicitly allowed as funny.
(dotimes (i 160) ; FIXME
(when (zerop (aref *character-attributes* i))
(setf (aref *character-attributes* i) funny-attribute))))
;;; For each character, the value of the corresponding element is the
;;; lowest base in which that character is a digit.
(defvar *digit-bases*
(make-array 128 ; FIXME
:element-type '(unsigned-byte 8)
:initial-element 36))
(declaim (type (simple-array (unsigned-byte 8) (#.128)) ; FIXME
*digit-bases*))
(dotimes (i 36)
(let ((char (digit-char i 36)))
(setf (aref *digit-bases* (char-code char)) i)))
;;; A FSM-like thingie that determines whether a symbol is a potential
;;; number or has evil characters in it.
(defun symbol-quotep (name)
(declare (simple-string name))
(macrolet ((advance (tag &optional (at-end t))
`(progn
(when (= index len)
,(if at-end '(go TEST-SIGN) '(return nil)))
(setq current (schar name index)
code (char-code current)
bits (cond ; FIXME
((< code 160) (aref attributes code))
((upper-case-p current) uppercase-attribute)
((lower-case-p current) lowercase-attribute)
(t other-attribute)))
(incf index)
(go ,tag)))
(test (&rest attributes)
`(not (zerop
(the fixnum
(logand
(logior ,@(mapcar
(lambda (x)
(or (cdr (assoc x
*attribute-names*))
(error "Blast!")))
attributes))
bits)))))
(digitp ()
`(and (< code 128) ; FIXME
(< (the fixnum (aref bases code)) base))))
(prog ((len (length name))
(attributes *character-attributes*)
(bases *digit-bases*)
(base *print-base*)
(letter-attribute
(case (readtable-case *readtable*)
(:upcase uppercase-attribute)
(:downcase lowercase-attribute)
(t (logior lowercase-attribute uppercase-attribute))))
(index 0)
(bits 0)
(code 0)
current)
(declare (fixnum len base index bits code))
(advance START t)
TEST-SIGN ; At end, see whether it is a sign...
(return (not (test sign)))
OTHER ; not potential number, see whether funny chars...
(let ((mask (logxor (logior lowercase-attribute uppercase-attribute
funny-attribute)
letter-attribute)))
(do ((i (1- index) (1+ i)))
((= i len) (return-from symbol-quotep nil))
(unless (zerop (logand (let* ((char (schar name i))
(code (char-code char)))
(cond
((< code 160) (aref attributes code))
((upper-case-p char) uppercase-attribute)
((lower-case-p char) lowercase-attribute)
(t other-attribute)))
mask))
(return-from symbol-quotep t))))
START
(when (digitp)
(if (test letter)
(advance LAST-DIGIT-ALPHA)
(advance DIGIT)))
(when (test letter number other slash) (advance OTHER nil))
(when (char= current #\.) (advance DOT-FOUND))
(when (test sign extension) (advance START-STUFF nil))
(return t)
DOT-FOUND ; leading dots...
(when (test letter) (advance START-DOT-MARKER nil))
(when (digitp) (advance DOT-DIGIT))
(when (test number other) (advance OTHER nil))
(when (test extension slash sign) (advance START-DOT-STUFF nil))
(when (char= current #\.) (advance DOT-FOUND))
(return t)
START-STUFF ; leading stuff before any dot or digit
(when (digitp)
(if (test letter)
(advance LAST-DIGIT-ALPHA)
(advance DIGIT)))
(when (test number other) (advance OTHER nil))
(when (test letter) (advance START-MARKER nil))
(when (char= current #\.) (advance START-DOT-STUFF nil))
(when (test sign extension slash) (advance START-STUFF nil))
(return t)
START-MARKER ; number marker in leading stuff...
(when (test letter) (advance OTHER nil))
(go START-STUFF)
START-DOT-STUFF ; leading stuff containing dot without digit...
(when (test letter) (advance START-DOT-STUFF nil))
(when (digitp) (advance DOT-DIGIT))
(when (test sign extension dot slash) (advance START-DOT-STUFF nil))
(when (test number other) (advance OTHER nil))
(return t)
START-DOT-MARKER ; number marker in leading stuff with dot..
;; leading stuff containing dot without digit followed by letter...
(when (test letter) (advance OTHER nil))
(go START-DOT-STUFF)
DOT-DIGIT ; in a thing with dots...
(when (test letter) (advance DOT-MARKER))
(when (digitp) (advance DOT-DIGIT))
(when (test number other) (advance OTHER nil))
(when (test sign extension dot slash) (advance DOT-DIGIT))
(return t)
DOT-MARKER ; number marker in number with dot...
(when (test letter) (advance OTHER nil))
(go DOT-DIGIT)
LAST-DIGIT-ALPHA ; previous char is a letter digit...
(when (or (digitp) (test sign slash))
(advance ALPHA-DIGIT))
(when (test letter number other dot) (advance OTHER nil))
(return t)
ALPHA-DIGIT ; seen a digit which is a letter...
(when (or (digitp) (test sign slash))
(if (test letter)
(advance LAST-DIGIT-ALPHA)
(advance ALPHA-DIGIT)))
(when (test letter) (advance ALPHA-MARKER))
(when (test number other dot) (advance OTHER nil))
(return t)
ALPHA-MARKER ; number marker in number with alpha digit...
(when (test letter) (advance OTHER nil))
(go ALPHA-DIGIT)
DIGIT ; seen only ordinary (non-alphabetic) numeric digits...
(when (digitp)
(if (test letter)
(advance ALPHA-DIGIT)
(advance DIGIT)))
(when (test number other) (advance OTHER nil))
(when (test letter) (advance MARKER))
(when (test extension slash sign) (advance DIGIT))
(when (char= current #\.) (advance DOT-DIGIT))
(return t)
MARKER ; number marker in a numeric number...
;; ("What," you may ask, "is a 'number marker'?" It's something
;; that a conforming implementation might use in number syntax.
;; See ANSI 2.3.1.1 "Potential Numbers as Tokens".)
(when (test letter) (advance OTHER nil))
(go DIGIT))))
;;;; *INTERNAL-SYMBOL-OUTPUT-FUN*
;;;;
;;;; case hackery: These functions are stored in
;;;; *INTERNAL-SYMBOL-OUTPUT-FUN* according to the values of
;;;; *PRINT-CASE* and READTABLE-CASE.
;;; called when:
;;; READTABLE-CASE *PRINT-CASE*
;;; :UPCASE :UPCASE
;;; :DOWNCASE :DOWNCASE
;;; :PRESERVE any
(defun output-preserve-symbol (pname stream)
(declare (simple-string pname))
(write-string pname stream))
;;; called when:
;;; READTABLE-CASE *PRINT-CASE*
;;; :UPCASE :DOWNCASE
(defun output-lowercase-symbol (pname stream)
(declare (simple-string pname))
(dotimes (index (length pname))
(let ((char (schar pname index)))
(write-char (char-downcase char) stream))))
;;; called when:
;;; READTABLE-CASE *PRINT-CASE*
;;; :DOWNCASE :UPCASE
(defun output-uppercase-symbol (pname stream)
(declare (simple-string pname))
(dotimes (index (length pname))
(let ((char (schar pname index)))
(write-char (char-upcase char) stream))))
;;; called when:
;;; READTABLE-CASE *PRINT-CASE*
;;; :UPCASE :CAPITALIZE
;;; :DOWNCASE :CAPITALIZE
(defun output-capitalize-symbol (pname stream)
(declare (simple-string pname))
(let ((prev-not-alphanum t)
(up (eq (readtable-case *readtable*) :upcase)))
(dotimes (i (length pname))
(let ((char (char pname i)))
(write-char (if up
(if (or prev-not-alphanum (lower-case-p char))
char
(char-downcase char))
(if prev-not-alphanum
(char-upcase char)
char))
stream)
(setq prev-not-alphanum (not (alphanumericp char)))))))
;;; called when:
;;; READTABLE-CASE *PRINT-CASE*
;;; :INVERT any
(defun output-invert-symbol (pname stream)
(declare (simple-string pname))
(let ((all-upper t)
(all-lower t))
(dotimes (i (length pname))
(let ((ch (schar pname i)))
(when (both-case-p ch)
(if (upper-case-p ch)
(setq all-lower nil)
(setq all-upper nil)))))
(cond (all-upper (output-lowercase-symbol pname stream))
(all-lower (output-uppercase-symbol pname stream))
(t
(write-string pname stream)))))
#|
(defun test1 ()
(let ((*readtable* (copy-readtable nil)))
(format t "READTABLE-CASE Input Symbol-name~@
----------------------------------~%")
(dolist (readtable-case '(:upcase :downcase :preserve :invert))
(setf (readtable-case *readtable*) readtable-case)
(dolist (input '("ZEBRA" "Zebra" "zebra"))
(format t "~&:~A~16T~A~24T~A"
(string-upcase readtable-case)
input
(symbol-name (read-from-string input)))))))
(defun test2 ()
(let ((*readtable* (copy-readtable nil)))
(format t "READTABLE-CASE *PRINT-CASE* Symbol-name Output Princ~@
--------------------------------------------------------~%")
(dolist (readtable-case '(:upcase :downcase :preserve :invert))
(setf (readtable-case *readtable*) readtable-case)
(dolist (*print-case* '(:upcase :downcase :capitalize))
(dolist (symbol '(|ZEBRA| |Zebra| |zebra|))
(format t "~&:~A~15T:~A~29T~A~42T~A~50T~A"
(string-upcase readtable-case)
(string-upcase *print-case*)
(symbol-name symbol)
(prin1-to-string symbol)
(princ-to-string symbol)))))))
|#
;;;; recursive objects
(defun output-list (list stream)
(descend-into (stream)
(write-char #\( stream)
(let ((length 0)
(list list))
(loop
(punt-print-if-too-long length stream)
(output-object (pop list) stream)
(unless list
(return))
(when (or (atom list)
(check-for-circularity list))
(write-string " . " stream)
(output-object list stream)
(return))
(write-char #\space stream)
(incf length)))
(write-char #\) stream)))
(defun output-unreadable-vector-readably (vector stream)
(declare (vector vector))
(write-string "#." stream)
(write `(coerce ,(coerce vector '(vector t))
'(simple-array ,(array-element-type vector) (*)))
:stream stream))
(defun output-vector (vector stream)
(declare (vector vector))
(cond ((stringp vector)
(cond ((and *print-readably*
(not (eq (array-element-type vector)
(load-time-value
(array-element-type
(make-array 0 :element-type 'character))))))
(print-not-readable-error vector stream))
((or *print-escape* *print-readably*)
(write-char #\" stream)
(quote-string vector stream)
(write-char #\" stream))
(t
(write-string vector stream))))
((not (or *print-array* *print-readably*))
(output-terse-array vector stream))
((bit-vector-p vector)
(write-string "#*" stream)
(dovector (bit vector)
;; (Don't use OUTPUT-OBJECT here, since this code
;; has to work for all possible *PRINT-BASE* values.)
(write-char (if (zerop bit) #\0 #\1) stream)))
((or (not *print-readably*)
(array-readably-printable-p vector))
(descend-into (stream)
(write-string "#(" stream)
(dotimes (i (length vector))
(unless (zerop i)
(write-char #\space stream))
(punt-print-if-too-long i stream)
(output-object (aref vector i) stream))
(write-string ")" stream)))
(*read-eval*
(output-unreadable-vector-readably vector stream))
(t
(print-not-readable-error vector stream))))
;;; This function outputs a string quoting characters sufficiently
;;; so that someone can read it in again. Basically, put a slash in
;;; front of an character satisfying NEEDS-SLASH-P.
(defun quote-string (string stream)
(macrolet ((needs-slash-p (char)
;; KLUDGE: We probably should look at the readtable, but just do
;; this for now. [noted by anonymous long ago] -- WHN 19991130
`(or (char= ,char #\\)
(char= ,char #\"))))
(with-array-data ((data string) (start) (end)
:check-fill-pointer t)
(do ((index start (1+ index)))
((>= index end))
(let ((char (schar data index)))
(when (needs-slash-p char) (write-char #\\ stream))
(write-char char stream))))))
(defun array-readably-printable-p (array)
(and (eq (array-element-type array) t)
(let ((zero (position 0 (array-dimensions array)))
(number (position 0 (array-dimensions array)
:test (complement #'eql)
:from-end t)))
(or (null zero) (null number) (> zero number)))))
;;; Output the printed representation of any array in either the #< or #A
;;; form.
(defun output-array (array stream)
(if (or *print-array* *print-readably*)
(output-array-guts array stream)
(output-terse-array array stream)))
;;; Output the abbreviated #< form of an array.
(defun output-terse-array (array stream)
(let ((*print-level* nil)
(*print-length* nil))
(print-unreadable-object (array stream :type t :identity t))))
;;; Convert an array into a list that can be used with MAKE-ARRAY's
;;; :INITIAL-CONTENTS keyword argument.
(defun listify-array (array)
(with-array-data ((data array) (start) (end))
(declare (ignore end))
(labels ((listify (dimensions index)
(if (null dimensions)
(aref data index)
(let* ((dimension (car dimensions))
(dimensions (cdr dimensions))
(count (reduce #'* dimensions)))
(loop for i below dimension
collect (listify dimensions index)
do (incf index count))))))
(listify (array-dimensions array) start))))
(defun output-unreadable-array-readably (array stream)
(write-string "#." stream)
(write `(make-array ',(array-dimensions array)
:element-type ',(array-element-type array)
:initial-contents ',(listify-array array))
:stream stream))
;;; Output the readable #A form of an array.
(defun output-array-guts (array stream)
(cond ((or (not *print-readably*)
(array-readably-printable-p array))
(write-char #\# stream)
(let ((*print-base* 10)
(*print-radix* nil))
(output-integer (array-rank array) stream))
(write-char #\A stream)
(with-array-data ((data array) (start) (end))
(declare (ignore end))
(sub-output-array-guts data (array-dimensions array) stream start)))
(*read-eval*
(output-unreadable-array-readably array stream))
(t
(print-not-readable-error array stream))))
(defun sub-output-array-guts (array dimensions stream index)
(declare (type (simple-array * (*)) array) (fixnum index))
(cond ((null dimensions)
(output-object (aref array index) stream))
(t
(descend-into (stream)
(write-char #\( stream)
(let* ((dimension (car dimensions))
(dimensions (cdr dimensions))
(count (reduce #'* dimensions)))
(dotimes (i dimension)
(unless (zerop i)
(write-char #\space stream))
(punt-print-if-too-long i stream)
(sub-output-array-guts array dimensions stream index)
(incf index count)))
(write-char #\) stream)))))
;;; a trivial non-generic-function placeholder for PRINT-OBJECT, for
;;; use until CLOS is set up (at which time it will be replaced with
;;; the real generic function implementation)
(defun print-object (instance stream)
(default-structure-print instance stream *current-level-in-print*))
;;;; integer, ratio, and complex printing (i.e. everything but floats)
(defun %output-radix (base stream)
(write-char #\# stream)
(write-char (case base
(2 #\b)
(8 #\o)
(16 #\x)
(t (%output-reasonable-integer-in-base base 10 stream)
#\r))
stream))
(defun %output-reasonable-integer-in-base (n base stream)
(multiple-value-bind (q r)
(truncate n base)
;; Recurse until you have all the digits pushed on
;; the stack.
(unless (zerop q)
(%output-reasonable-integer-in-base q base stream))
;; Then as each recursive call unwinds, turn the
;; digit (in remainder) into a character and output
;; the character.
(write-char
(schar "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" r)
stream)))
;;; *POWER-CACHE* is an alist mapping bases to power-vectors. It is
;;; filled and probed by POWERS-FOR-BASE. SCRUB-POWER-CACHE is called
;;; always prior a GC to drop overly large bignums from the cache.
;;;
;;; It doesn't need a lock, but if you work on SCRUB-POWER-CACHE or
;;; POWERS-FOR-BASE, see that you don't break the assumptions!
(defvar *power-cache* nil)
(defconstant +power-cache-integer-length-limit+ 2048)
(defun scrub-power-cache ()
(let ((cache *power-cache*))
(dolist (cell cache)
(let ((powers (cdr cell)))
(declare (simple-vector powers))
(let ((too-big (position-if
(lambda (x)
(>= (integer-length x)
+power-cache-integer-length-limit+))
powers)))
(when too-big
(setf (cdr cell) (subseq powers 0 too-big))))))
;; Since base 10 is overwhelmingly common, make sure it's at head.
;; Try to keep other bases in a hopefully sensible order as well.
(if (eql 10 (caar cache))
(setf *power-cache* cache)
;; If we modify the list destructively we need to copy it, otherwise
;; an alist lookup in progress might be screwed.
(setf *power-cache* (sort (copy-list cache)
(lambda (a b)
(declare (fixnum a b))
(cond ((= 10 a) t)
((= 10 b) nil)
((= 16 a) t)
((= 16 b) nil)
((= 2 a) t)
((= 2 b) nil)
(t (< a b))))
:key #'car)))))
;;; Compute (and cache) a power vector for a BASE and LIMIT:
;;; the vector holds integers for which
;;; (aref powers k) == (expt base (expt 2 k))
;;; holds.
(defun powers-for-base (base limit)
(flet ((compute-powers (from)
(let (powers)
(do ((p from (* p p)))
((> p limit)
;; We don't actually need this, but we also
;; prefer not to cons it up a second time...
(push p powers))
(push p powers))
(nreverse powers))))
;; Grab a local reference so that we won't stuff consed at the
;; head by other threads -- or sorting by SCRUB-POWER-CACHE.
(let ((cache *power-cache*))
(let ((cell (assoc base cache)))
(if cell
(let* ((powers (cdr cell))
(len (length powers))
(max (svref powers (1- len))))
(if (> max limit)
powers
(let ((new
(concatenate 'vector powers
(compute-powers (* max max)))))
(setf (cdr cell) new)
new)))
(let ((powers (coerce (compute-powers base) 'vector)))
;; Add new base to head: SCRUB-POWER-CACHE will later
;; put it to a better place.
(setf *power-cache* (acons base powers cache))
powers))))))
;; Algorithm by Harald Hanche-Olsen, sbcl-devel 2005-02-05
(defun %output-huge-integer-in-base (n base stream)
(declare (type bignum n) (type fixnum base))
;; POWER is a vector for which the following holds:
;; (aref power k) == (expt base (expt 2 k))
(let* ((power (powers-for-base base n))
(k-start (or (position-if (lambda (x) (> x n)) power)
(bug "power-vector too short"))))
(labels ((bisect (n k exactp)
(declare (fixnum k))
;; N is the number to bisect
;; K on initial entry BASE^(2^K) > N
;; EXACTP is true if 2^K is the exact number of digits
(cond ((zerop n)
(when exactp
(loop repeat (ash 1 k) do (write-char #\0 stream))))
((zerop k)
(write-char
(schar "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" n)
stream))
(t
(setf k (1- k))
(multiple-value-bind (q r) (truncate n (aref power k))
;; EXACTP is NIL only at the head of the
;; initial number, as we don't know the number
;; of digits there, but we do know that it
;; doesn't get any leading zeros.
(bisect q k exactp)
(bisect r k (or exactp (plusp q))))))))
(bisect n k-start nil))))
(defun %output-integer-in-base (integer base stream)
(when (minusp integer)
(write-char #\- stream)
(setf integer (- integer)))
;; The ideal cutoff point between these two algorithms is almost
;; certainly quite platform dependent: this gives 87 for 32 bit
;; SBCL, which is about right at least for x86/Darwin.
(if (or (fixnump integer)
(< (integer-length integer) (* 3 sb!vm:n-positive-fixnum-bits)))
(%output-reasonable-integer-in-base integer base stream)
(%output-huge-integer-in-base integer base stream)))
(defun output-integer (integer stream)
(let ((base *print-base*))
(when (and (/= base 10) *print-radix*)
(%output-radix base stream))
(%output-integer-in-base integer base stream)
(when (and *print-radix* (= base 10))
(write-char #\. stream))))
(defun output-ratio (ratio stream)
(let ((base *print-base*))
(when *print-radix*
(%output-radix base stream))
(%output-integer-in-base (numerator ratio) base stream)
(write-char #\/ stream)
(%output-integer-in-base (denominator ratio) base stream)))
(defun output-complex (complex stream)
(write-string "#C(" stream)
;; FIXME: Could this just be OUTPUT-NUMBER?
(output-object (realpart complex) stream)
(write-char #\space stream)
(output-object (imagpart complex) stream)
(write-char #\) stream))
;;;; float printing
;;; FLONUM-TO-STRING (and its subsidiary function FLOAT-STRING) does
;;; most of the work for all printing of floating point numbers in
;;; FORMAT. It converts a floating point number to a string in a free
;;; or fixed format with no exponent. The interpretation of the
;;; arguments is as follows:
;;;
;;; X - The floating point number to convert, which must not be
;;; negative.
;;; WIDTH - The preferred field width, used to determine the number
;;; of fraction digits to produce if the FDIGITS parameter
;;; is unspecified or NIL. If the non-fraction digits and the
;;; decimal point alone exceed this width, no fraction digits
;;; will be produced unless a non-NIL value of FDIGITS has been
;;; specified. Field overflow is not considerd an error at this
;;; level.
;;; FDIGITS - The number of fractional digits to produce. Insignificant
;;; trailing zeroes may be introduced as needed. May be
;;; unspecified or NIL, in which case as many digits as possible
;;; are generated, subject to the constraint that there are no
;;; trailing zeroes.
;;; SCALE - If this parameter is specified or non-NIL, then the number
;;; printed is (* x (expt 10 scale)). This scaling is exact,
;;; and cannot lose precision.
;;; FMIN - This parameter, if specified or non-NIL, is the minimum
;;; number of fraction digits which will be produced, regardless
;;; of the value of WIDTH or FDIGITS. This feature is used by
;;; the ~E format directive to prevent complete loss of
;;; significance in the printed value due to a bogus choice of
;;; scale factor.
;;;
;;; Returns:
;;; (VALUES DIGIT-STRING DIGIT-LENGTH LEADING-POINT TRAILING-POINT DECPNT)
;;; where the results have the following interpretation:
;;;
;;; DIGIT-STRING - The decimal representation of X, with decimal point.
;;; DIGIT-LENGTH - The length of the string DIGIT-STRING.
;;; LEADING-POINT - True if the first character of DIGIT-STRING is the
;;; decimal point.
;;; TRAILING-POINT - True if the last character of DIGIT-STRING is the
;;; decimal point.
;;; POINT-POS - The position of the digit preceding the decimal
;;; point. Zero indicates point before first digit.
;;;
;;; NOTE: FLONUM-TO-STRING goes to a lot of trouble to guarantee
;;; accuracy. Specifically, the decimal number printed is the closest
;;; possible approximation to the true value of the binary number to
;;; be printed from among all decimal representations with the same
;;; number of digits. In free-format output, i.e. with the number of
;;; digits unconstrained, it is guaranteed that all the information is
;;; preserved, so that a properly- rounding reader can reconstruct the
;;; original binary number, bit-for-bit, from its printed decimal
;;; representation. Furthermore, only as many digits as necessary to
;;; satisfy this condition will be printed.
;;;
;;; FLOAT-DIGITS actually generates the digits for positive numbers;
;;; see below for comments.
(defun flonum-to-string (x &optional width fdigits scale fmin)
(declare (type float x))
;; FIXME: I think only FORMAT-DOLLARS calls FLONUM-TO-STRING with
;; possibly-negative X.
(setf x (abs x))
(multiple-value-bind (e string)
(if fdigits
(flonum-to-digits x (min (- (+ fdigits (or scale 0)))
(- (or fmin 0))))
(if (and width (> width 1))
(let ((w (multiple-value-list
(flonum-to-digits x
(max 1
(+ (1- width)
(if (and scale (minusp scale))
scale 0)))
t)))
(f (multiple-value-list
(flonum-to-digits x (- (+ (or fmin 0)
(if scale scale 0)))))))
(cond
((>= (length (cadr w)) (length (cadr f)))
(values-list w))
(t (values-list f))))
(flonum-to-digits x)))
(let ((e (if (zerop x)
e
(+ e (or scale 0))))
(stream (make-string-output-stream)))
(if (plusp e)
(progn
(write-string string stream :end (min (length string) e))
(dotimes (i (- e (length string)))
(write-char #\0 stream))
(write-char #\. stream)
(write-string string stream :start (min (length string) e))
(when fdigits
(dotimes (i (- fdigits
(- (length string)
(min (length string) e))))
(write-char #\0 stream))))
(progn
(write-string "." stream)
(dotimes (i (- e))
(write-char #\0 stream))
(write-string string stream :end (when fdigits
(min (length string)
(max (or fmin 0)
(+ fdigits e)))))
(when fdigits
(dotimes (i (+ fdigits e (- (length string))))
(write-char #\0 stream)))))
(let ((string (get-output-stream-string stream)))
(values string (length string)
(char= (char string 0) #\.)
(char= (char string (1- (length string))) #\.)
(position #\. string))))))
;;; implementation of figure 1 from Burger and Dybvig, 1996. It is
;;; extended in order to handle rounding.
;;;
;;; As the implementation of the Dragon from Classic CMUCL (and
;;; previously in SBCL above FLONUM-TO-STRING) says: "DO NOT EVEN
;;; THINK OF ATTEMPTING TO UNDERSTAND THIS CODE WITHOUT READING THE
;;; PAPER!", and in this case we have to add that even reading the
;;; paper might not bring immediate illumination as CSR has attempted
;;; to turn idiomatic Scheme into idiomatic Lisp.
;;;
;;; FIXME: figure 1 from Burger and Dybvig is the unoptimized
;;; algorithm, noticeably slow at finding the exponent. Figure 2 has
;;; an improved algorithm, but CSR ran out of energy.
;;;
;;; possible extension for the enthusiastic: printing floats in bases
;;; other than base 10.
(defconstant single-float-min-e
(- 2 sb!vm:single-float-bias sb!vm:single-float-digits))
(defconstant double-float-min-e
(- 2 sb!vm:double-float-bias sb!vm:double-float-digits))
#!+long-float
(defconstant long-float-min-e
(nth-value 1 (decode-float least-positive-long-float)))
(defun flonum-to-digits (v &optional position relativep)
(let ((print-base 10) ; B
(float-radix 2) ; b
(float-digits (float-digits v)) ; p
(digit-characters "0123456789")
(min-e
(etypecase v
(single-float single-float-min-e)
(double-float double-float-min-e)
#!+long-float
(long-float long-float-min-e))))
(multiple-value-bind (f e)
(integer-decode-float v)
(let (;; FIXME: these even tests assume normal IEEE rounding
;; mode. I wonder if we should cater for non-normal?
(high-ok (evenp f))
(low-ok (evenp f)))
(with-push-char (:element-type base-char)
(labels ((scale (r s m+ m-)
(do ((k 0 (1+ k))
(s s (* s print-base)))
((not (or (> (+ r m+) s)
(and high-ok (= (+ r m+) s))))
(do ((k k (1- k))
(r r (* r print-base))
(m+ m+ (* m+ print-base))
(m- m- (* m- print-base)))
((not (and (plusp (- r m-)) ; Extension to handle zero
(or (< (* (+ r m+) print-base) s)
(and (not high-ok)
(= (* (+ r m+) print-base) s)))))
(values k (generate r s m+ m-)))))))
(generate (r s m+ m-)
(let (d tc1 tc2)
(tagbody
loop
(setf (values d r) (truncate (* r print-base) s))
(setf m+ (* m+ print-base))
(setf m- (* m- print-base))
(setf tc1 (or (< r m-) (and low-ok (= r m-))))
(setf tc2 (or (> (+ r m+) s)
(and high-ok (= (+ r m+) s))))
(when (or tc1 tc2)
(go end))
(push-char (char digit-characters d))
(go loop)
end
(let ((d (cond
((and (not tc1) tc2) (1+ d))
((and tc1 (not tc2)) d)
(t ; (and tc1 tc2)
(if (< (* r 2) s) d (1+ d))))))
(push-char (char digit-characters d))
(return-from generate (get-pushed-string))))))
(initialize ()
(let (r s m+ m-)
(if (>= e 0)
(let* ((be (expt float-radix e))
(be1 (* be float-radix)))
(if (/= f (expt float-radix (1- float-digits)))
(setf r (* f be 2)
s 2
m+ be
m- be)
(setf r (* f be1 2)
s (* float-radix 2)
m+ be1
m- be)))
(if (or (= e min-e)
(/= f (expt float-radix (1- float-digits))))
(setf r (* f 2)
s (* (expt float-radix (- e)) 2)
m+ 1
m- 1)
(setf r (* f float-radix 2)
s (* (expt float-radix (- 1 e)) 2)
m+ float-radix
m- 1)))
(when position
(when relativep
(aver (> position 0))
(do ((k 0 (1+ k))
;; running out of letters here
(l 1 (* l print-base)))
((>= (* s l) (+ r m+))
;; k is now \hat{k}
(if (< (+ r (* s (/ (expt print-base (- k position)) 2)))
(* s (expt print-base k)))
(setf position (- k position))
(setf position (- k position 1))))))
(let ((low (max m- (/ (* s (expt print-base position)) 2)))
(high (max m+ (/ (* s (expt print-base position)) 2))))
(when (<= m- low)
(setf m- low)
(setf low-ok t))
(when (<= m+ high)
(setf m+ high)
(setf high-ok t))))
(values r s m+ m-))))
(multiple-value-bind (r s m+ m-) (initialize)
(scale r s m+ m-))))))))
;;; Given a non-negative floating point number, SCALE-EXPONENT returns
;;; a new floating point number Z in the range (0.1, 1.0] and an
;;; exponent E such that Z * 10^E is (approximately) equal to the
;;; original number. There may be some loss of precision due the
;;; floating point representation. The scaling is always done with
;;; long float arithmetic, which helps printing of lesser precisions
;;; as well as avoiding generic arithmetic.
;;;
;;; When computing our initial scale factor using EXPT, we pull out
;;; part of the computation to avoid over/under flow. When
;;; denormalized, we must pull out a large factor, since there is more
;;; negative exponent range than positive range.
(eval-when (:compile-toplevel :execute)
(setf *read-default-float-format*
#!+long-float 'long-float #!-long-float 'double-float))
(defun scale-exponent (original-x)
(let* ((x (coerce original-x 'long-float)))
(multiple-value-bind (sig exponent) (decode-float x)
(declare (ignore sig))
(if (= x 0.0e0)
(values (float 0.0e0 original-x) 1)
(let* ((ex (locally (declare (optimize (safety 0)))
(the fixnum
(round (* exponent
;; this is the closest double float
;; to (log 2 10), but expressed so
;; that we're not vulnerable to the
;; host lisp's interpretation of
;; arithmetic. (FIXME: it turns
;; out that sbcl itself is off by 1
;; ulp in this value, which is a
;; little unfortunate.)
(load-time-value
#!-long-float
(make-double-float 1070810131 1352628735)
#!+long-float
(error "(log 2 10) not computed")))))))
(x (if (minusp ex)
(if (float-denormalized-p x)
#!-long-float
(* x 1.0e16 (expt 10.0e0 (- (- ex) 16)))
#!+long-float
(* x 1.0e18 (expt 10.0e0 (- (- ex) 18)))
(* x 10.0e0 (expt 10.0e0 (- (- ex) 1))))
(/ x 10.0e0 (expt 10.0e0 (1- ex))))))
(do ((d 10.0e0 (* d 10.0e0))
(y x (/ x d))
(ex ex (1+ ex)))
((< y 1.0e0)
(do ((m 10.0e0 (* m 10.0e0))
(z y (* y m))
(ex ex (1- ex)))
((>= z 0.1e0)
(values (float z original-x) ex))
(declare (long-float m) (integer ex))))
(declare (long-float d))))))))
(eval-when (:compile-toplevel :execute)
(setf *read-default-float-format* 'single-float))
;;;; entry point for the float printer
;;; the float printer as called by PRINT, PRIN1, PRINC, etc. The
;;; argument is printed free-format, in either exponential or
;;; non-exponential notation, depending on its magnitude.
;;;
;;; NOTE: When a number is to be printed in exponential format, it is
;;; scaled in floating point. Since precision may be lost in this
;;; process, the guaranteed accuracy properties of FLONUM-TO-STRING
;;; are lost. The difficulty is that FLONUM-TO-STRING performs
;;; extensive computations with integers of similar magnitude to that
;;; of the number being printed. For large exponents, the bignums
;;; really get out of hand. If bignum arithmetic becomes reasonably
;;; fast and the exponent range is not too large, then it might become
;;; attractive to handle exponential notation with the same accuracy
;;; as non-exponential notation, using the method described in the
;;; Steele and White paper.
;;;
;;; NOTE II: this has been bypassed slightly by implementing Burger
;;; and Dybvig, 1996. When someone has time (KLUDGE) they can
;;; probably (a) implement the optimizations suggested by Burger and
;;; Dyvbig, and (b) remove all vestiges of Dragon4, including from
;;; fixed-format printing.
;;; Print the appropriate exponent marker for X and the specified exponent.
(defun print-float-exponent (x exp stream)
(declare (type float x) (type integer exp) (type stream stream))
(let ((*print-radix* nil))
(if (typep x *read-default-float-format*)
(unless (eql exp 0)
(format stream "e~D" exp))
(format stream "~C~D"
(etypecase x
(single-float #\f)
(double-float #\d)
(short-float #\s)
(long-float #\L))
exp))))
(defun output-float-infinity (x stream)
(declare (float x) (stream stream))
(cond (*read-eval*
(write-string "#." stream))
(*print-readably*
(return-from output-float-infinity
(print-not-readable-error x stream)))
(t
(write-string "#<" stream)))
(write-string "SB-EXT:" stream)
(write-string (symbol-name (float-format-name x)) stream)
(write-string (if (plusp x) "-POSITIVE-" "-NEGATIVE-")
stream)
(write-string "INFINITY" stream)
(unless *read-eval*
(write-string ">" stream)))
(defun output-float-nan (x stream)
(print-unreadable-object (x stream)
(princ (float-format-name x) stream)
(write-string (if (float-trapping-nan-p x) " trapping" " quiet") stream)
(write-string " NaN" stream)))
;;; the function called by OUTPUT-OBJECT to handle floats
(defun output-float (x stream)
(cond
((float-infinity-p x)
(output-float-infinity x stream))
((float-nan-p x)
(output-float-nan x stream))
(t
(let ((x (cond ((minusp (float-sign x))
(write-char #\- stream)
(- x))
(t
x))))
(cond
((zerop x)
(write-string "0.0" stream)
(print-float-exponent x 0 stream))
(t
(output-float-aux x stream -3 8)))))))
(defun output-float-aux (x stream e-min e-max)
(multiple-value-bind (e string)
(flonum-to-digits x)
(cond
((< e-min e e-max)
(if (plusp e)
(progn
(write-string string stream :end (min (length string) e))
(dotimes (i (- e (length string)))
(write-char #\0 stream))
(write-char #\. stream)
(write-string string stream :start (min (length string) e))
(when (<= (length string) e)
(write-char #\0 stream))
(print-float-exponent x 0 stream))
(progn
(write-string "0." stream)
(dotimes (i (- e))
(write-char #\0 stream))
(write-string string stream)
(print-float-exponent x 0 stream))))
(t (write-string string stream :end 1)
(write-char #\. stream)
(write-string string stream :start 1)
(print-float-exponent x (1- e) stream)))))
;;;; other leaf objects
;;; If *PRINT-ESCAPE* is false, just do a WRITE-CHAR, otherwise output
;;; the character name or the character in the #\char format.
(defun output-character (char stream)
(if (or *print-escape* *print-readably*)
(let ((graphicp (and (graphic-char-p char)
(standard-char-p char)))
(name (char-name char)))
(write-string "#\\" stream)
(if (and name (not graphicp))
(quote-string name stream)
(write-char char stream)))
(write-char char stream)))
(defun output-sap (sap stream)
(declare (type system-area-pointer sap))
(cond (*read-eval*
(format stream "#.(~S #X~8,'0X)" 'int-sap (sap-int sap)))
(t
(print-unreadable-object (sap stream)
(format stream "system area pointer: #X~8,'0X" (sap-int sap))))))
(defun output-weak-pointer (weak-pointer stream)
(declare (type weak-pointer weak-pointer))
(print-unreadable-object (weak-pointer stream)
(multiple-value-bind (value validp) (weak-pointer-value weak-pointer)
(cond (validp
(write-string "weak pointer: " stream)
(write value :stream stream))
(t
(write-string "broken weak pointer" stream))))))
(defun output-code-component (component stream)
(print-unreadable-object (component stream :identity t)
(let ((dinfo (%code-debug-info component)))
(cond ((eq dinfo :bogus-lra)
(write-string "bogus code object" stream))
(t
(write-string "code object" stream)
(when dinfo
(write-char #\space stream)
(output-object (sb!c::debug-info-name dinfo) stream)))))))
(defun output-lra (lra stream)
(print-unreadable-object (lra stream :identity t)
(write-string "return PC object" stream)))
(defun output-fdefn (fdefn stream)
(print-unreadable-object (fdefn stream)
(write-string "FDEFINITION object for " stream)
(output-object (fdefn-name fdefn) stream)))
#!+sb-simd-pack
(defun output-simd-pack (pack stream)
(declare (type simd-pack pack))
(cond ((and *print-readably* *read-eval*)
(etypecase pack
((simd-pack double-float)
(multiple-value-call #'format stream
"#.(~S ~S ~S)"
'%make-simd-pack-double
(%simd-pack-doubles pack)))
((simd-pack single-float)
(multiple-value-call #'format stream
"#.(~S ~S ~S ~S ~S)"
'%make-simd-pack-single
(%simd-pack-singles pack)))
(t
(multiple-value-call #'format stream
"#.(~S #X~16,'0X #X~16,'0X)"
'%make-simd-pack-ub64
(%simd-pack-ub64s pack)))))
(t
(print-unreadable-object (pack stream)
(flet ((all-ones-p (value start end &aux (mask (- (ash 1 end) (ash 1 start))))
(= (logand value mask) mask))
(split-num (value start)
(loop
for i from 0 to 3
and v = (ash value (- start)) then (ash v -8)
collect (logand v #xFF))))
(multiple-value-bind (low high)
(%simd-pack-ub64s pack)
(etypecase pack
((simd-pack double-float)
(multiple-value-bind (v0 v1) (%simd-pack-doubles pack)
(format stream "~S~@{ ~:[~,13E~;~*TRUE~]~}"
'simd-pack
(all-ones-p low 0 64) v0
(all-ones-p high 0 64) v1)))
((simd-pack single-float)
(multiple-value-bind (v0 v1 v2 v3) (%simd-pack-singles pack)
(format stream "~S~@{ ~:[~,7E~;~*TRUE~]~}"
'simd-pack
(all-ones-p low 0 32) v0
(all-ones-p low 32 64) v1
(all-ones-p high 0 32) v2
(all-ones-p high 32 64) v3)))
(t
(format stream "~S~@{ ~{ ~2,'0X~}~}"
'simd-pack
(split-num low 0) (split-num low 32)
(split-num high 0) (split-num high 32))))))))))
;;;; functions
;;; Output OBJECT as using PRINT-OBJECT if it's a
;;; FUNCALLABLE-STANDARD-CLASS, or return NIL otherwise.
;;;
;;; The definition here is a simple temporary placeholder. It will be
;;; overwritten by a smarter version (capable of calling generic
;;; PRINT-OBJECT when appropriate) when CLOS is installed.
(defun printed-as-funcallable-standard-class (object stream)
(declare (ignore object stream))
nil)
(defun output-fun (object stream)
(let* ((name (%fun-name object))
(proper-name-p (and (legal-fun-name-p name) (fboundp name)
(eq (fdefinition name) object))))
(print-unreadable-object (object stream :identity (not proper-name-p))
(format stream "~:[FUNCTION~;CLOSURE~]~@[ ~S~]"
(closurep object)
name))))
;;;; catch-all for unknown things
(defun output-random (object stream)
(print-unreadable-object (object stream :identity t)
(let ((lowtag (lowtag-of object)))
(case lowtag
(#.sb!vm:other-pointer-lowtag
(let ((widetag (widetag-of object)))
(case widetag
(#.sb!vm:value-cell-header-widetag
(write-string "value cell " stream)
(output-object (value-cell-ref object) stream))
(t
(write-string "unknown pointer object, widetag=" stream)
(let ((*print-base* 16) (*print-radix* t))
(output-integer widetag stream))))))
((#.sb!vm:fun-pointer-lowtag
#.sb!vm:instance-pointer-lowtag
#.sb!vm:list-pointer-lowtag)
(write-string "unknown pointer object, lowtag=" stream)
(let ((*print-base* 16) (*print-radix* t))
(output-integer lowtag stream)))
(t
(case (widetag-of object)
(#.sb!vm:unbound-marker-widetag
(write-string "unbound marker" stream))
(t
(write-string "unknown immediate object, lowtag=" stream)
(let ((*print-base* 2) (*print-radix* t))
(output-integer lowtag stream))
(write-string ", widetag=" stream)
(let ((*print-base* 16) (*print-radix* t))
(output-integer (widetag-of object) stream)))))))))